hi nec,
jus share wif u some places u may be interested in...if u intend to go taj (it's better to take frm the entrance overlooking the taj), then u can go to 2 more places...agra fort and fatehpur shikri...if u r interested in going to jaipur, abt 5-6 hrs bus ride frm agra, then u can consider maharaja's city palace, hawa mahal and birla temple (no shoes allowed...ouch!)